/ Dictionary / Index I infrasonics: Meaning and Definition of Find definitions for: in•fra•son•ics Pronunciation: (in"fru-son'iks), [key] — n. (used with a sing. v.) the branch of science that deals with infrasonic phenomena. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. infrasonic infrasound Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language